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Subject :NSO    Class : Class 4

Ravi set up an experiment as shown in the given figure.The figure shows five identical balls being suspended on a rod by strings of different lengths. Ravi then cut all five strings at the same time and the balls were allowed to fall freely to the ground.

Which of these statements holds true for this experiment?

ABall ‘b’ had the greatest impact on the ground.
BBall ‘a’ had less gravitational potential energy than ball ‘c’ at the start.
CBall ‘d’ had the most gravitational potential energy at the start.
DBalls ‘a’ and ‘e’ had different amounts of gravitational potential energy at the start due to their different positions along the rod.


Ans 1:

Class : Class 4
A) Ball ‘b’ had the greatest impact on the ground.

Ans 2:

Class : Class 4
The answer is [A]

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Subject :NSO    Class : Class 6

Which of the following statements are true about acid rain ?
(i) Acid rain has harmful effects on the living beings.
(ii) Acid rain mainly comprises of H2SO4 and HNO3.
(iii) Greenhouse gases are mainly responsible for causing acid rain.
(iv) Acid rain causes damage to buildings.

A (i) and (ii) only
B (i) and (iii) only
C (i), (iii) and (iv) only
D (i), (ii) and (iv) only


but here option C is also true ,so there have the option as 'all of these'.

Ans 1:

Class : Class 6
all are correct

Ans 2:

Class : Class 3
D

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Subject :NSO    Class : Class 7

Kirti kept a metal spoon in a glass jar filled with pickle for a few days. She observed that there were holes in the spoon. What could be the possible reason for this?

A Oil present in pickle dissolves the metal.
B Oil present in pickle liberates a gas in which metal gets dissolved.
C Metal reacts with acid present in pickle to form salt hence, metal gets dissolved.
D The glass reacts with metal to give acid which dissolves the metal.


i didnt get this . answer says acid reacts with metal to form salt but acid reacts with metal to form hydrogen can you help me ?

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7
C Metal reacts with acids

Ans 3:

Class : Class 7
Answer is C as metal react with acid to form salt and hydrogen both

Ans 4:

Class : Class 7
C Metal reacts with acids

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
It started in '1973', NOT in '1927' you have got your reference wrong. The question says 1974 which is a year wrong so I think they made a mistake while preparing the questions.

Ans 2:

Class : Class 3
richa is also wrong as chipko movement started in 1927

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
A

Ans 2:

Class : Class 3

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5

Ans 2:

Class : Class 4

Ans 3:

Class : Class 4
A)COLDER ,WARMER

Ans 4:

Class : Class 5

Ans 5:

Class : Class 4
A) Colder, Warmer

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
A

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Subject :NSO    Class : Class 3

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